AISI – SAE 204 Cu Stainless Steel – Composition, Properties and Uses
When it comes to choosing a metal for your project, you’ll want a material that is strong, durable, and resistant to corrosion. That’s why so many people turn to 204 Cu stainless steel. This alloy contains chromium and nickel as its primary components and is made up of 18-20% chromium, 9-13% nickel, 4-6% manganese, and 0.2%-2% copper. Let’s take a closer look at the composition, physical properties, mechanical properties, and uses of this unique alloy.
204Cu Chemical Composition
As previously stated, 204 Cu SS is composed of 18-20% chromium and 9-13% nickel with some trace amounts of other metals such as manganese and copper. This combination gives the alloy excellent strength and resistance to corrosion. It also has good weldability properties due to its low carbon content; however, higher carbon levels can reduce the material’s ductility.
|
%C
|
%Si
|
%Mn
|
%P
|
%S
|
%Cr
|
%Ni
|
%Cu
|
%N
|
–
|
–
|
–
|
|---|---|---|---|---|---|---|---|---|---|---|---|
|
0.15 max
|
1.00 max
|
6.50-9.00
|
0.100 max
|
0.030 max
|
14.00-17.50
|
1.50-3.50
|
1.80-4.00
|
0.050-0.250
|
–
|
–
|
–
|
204Cu Physical Properties
Regarding physical properties such as tensile strength and yield strength, 204 Cu stainless steel has one of the highest values compared to other materials. It also has excellent fatigue strength, making it an ideal choice for applications requiring high stress tolerance or vibration resistance levels. Additionally, this alloy has a high melting point (1450°C) which means it can withstand high temperatures without deforming or becoming brittle as some other metals would do under extreme heat conditions.
|
Density
|
δ
|
[g/cm3]
|
Physical
|
Room temp.
|
7.81
|
|
Young’s modulus
|
E
|
[GPa]
|
Mechanical
|
–
|
200
|
|
Specific heat
|
c
|
[J/kg-K]
|
Thermal
|
Room temp.
|
496
|
|
Coefficient of linear thermal expansion
|
α
|
[10^-6/ºC]
|
Thermal
|
(ΔT=0-100°C)
|
17.1
|
|
Thermal conductivity
|
λ
|
[W/(m·K)]
|
Thermal
|
Room temp.
|
15.0
|
|
Electric resistivity
|
ρ
|
[Ω*m*10^-9]
|
Electric
|
–
|
163
|
|
Relative magnetic permeability
|
µ
|
–
|
Magnetic
|
Param. / Slightly ferrom.
|
1.03 / max 10
|
204 Cu Mechanical Properties
The mechanical properties of 204 Cu stainless steel make it an ideal choice for applications requiring great amounts of durability and strength while maintaining flexibility. This metal has a good balance between hardness (240 HB) and ductility (70%), which allows it to be used in various applications such as automotive parts or industrial machinery components where resistance against wear is important, but flexibility is still needed for certain operations like machining or forming processes. Additionally, its low coefficient of thermal expansion makes this metal suitable for use in environments with variable temperatures since it will retain its shape even when exposed to extreme changes in temperature.
|
Hardness
|
Mechanical
|
[HRC]
|
25 – 45
|
–
|
–
|
|
Ultimate tensile strength
|
Mechanical
|
[MPa]
|
635 – 1195
|
[psix10^3]
|
92 – 173
|
|
Service temperature
|
Thermal
|
[ºC]
|
-196 / 700
|
[ºF]
|
-320.8 / 16
|
204 Cu Equivalent
|
ITA
|
USA
|
GER
|
FRA
|
UK
|
RUS
|
CHN
|
JAP
|
|---|---|---|---|---|---|---|---|
|
X8CrMnCuNB17-8-3
|
204 Cu
|
1.4597
|
X8CrMnCuNB17-8-3
|
X8CrMnCuNB17-8-3
|
–
|
–
|
–
|
204 Cu Thermal Properties
|
Diameters (min/max)
|
U.o.M.
|
Diameters (min/max)
|
U.o.M.
|
Precision grades (ISO 3290-1 / DIN 5401 / AFBMA)
|
|---|---|---|---|---|
|
0.800 – 180.000
|
[mm]
|
1/32 – 7
|
[“]
|
G100-200-300-500-600-700-1000
|
204 Cu Uses
Grade 204 Cu is an incredibly versatile material, suitable for use in a wide range of industries. As it offers both formability and strength, 204 Cu stainless steel can be used for everything from construction to automotive parts. In the food-handling industry, this metal is corrosion-resistant and can be used in cookware and heat exchangers due to its high-temperature tolerance. Further highlighting its malleability, 204 Cu stainless steel can also be utilized in cryogenic tanks as well as high-pressure valves due to its superior tensile strength. With these many uses and benefits, it’s no surprise that this versatile material continues to be a popular choice in modern-day manufacturing needs.
Conclusion
204 Cu stainless steel is an excellent choice when you need a metal that offers superior strength and durability while remaining flexible enough to be formed into different shapes if necessary. Its composition ensures that it resists corrosion while having great weldability properties due to its low carbon content level; plus, it can withstand extreme temperatures without deforming or becoming brittle, thanks to its high melting point value. Its mechanical properties make this material perfect for applications requiring high levels of stress tolerance or vibration resistance while still having enough flexibility for certain operations like machining or forming processes; plus, due to its low coefficient of thermal expansion, it remains stable even when exposed to varying temperatures making it suitable for outdoor applications too! If you are looking for an affordable yet reliable metal with all these features, then 204 Cu Stainless Steel may just be the perfect option for your needs!
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